云南某低品位难选铁锡矿选矿试验研究

云南某低品位难选铁锡矿中铁、锡品位分别为30.91%和0.23%，主要回收矿物为磁铁矿和锡石。为充分回收矿石中的有价组分，依据原矿性质，确定采用磁选选铁—浮选选硫—脱泥—锡石选别（重选+浮选）的工艺流程进行选矿试验研究。原矿经过1粗1精两段磁选可以获得铁品位60.69%、铁回收率78.63%的弱磁精矿。弱磁尾矿经过1粗1精2扫选硫后，选硫尾矿中硫品位降至0.46%，硫精矿锡作业回收率仅为6.88%。将浮硫尾矿筛分为+0.043 mm和-0.043 mm粒级样，+0.043 mm粒级样通过摇床能获得锡品位6.48%、锡作业回收率52.54%的摇床精矿产品； -0.043 mm粒级样经水析脱除-0.01 mm细泥后，以水杨羟肟酸+GZ为锡石捕收剂，2号油为起泡剂，闭路浮选最终可获得锡品位5.69%、锡作业回收率70.23%的锡精矿产品，尾矿中锡品位降至0.12%。全流程试验最终获得铁品位60.69%、铁回收率78.63%的磁铁精矿，锡品位5.92%、锡回收率31.93%的锡精矿，总尾矿中锡品位降至0.14%，实现了该铁锡矿资源的综合回收。

Experimental Study on Beneficiation of a Low Grade Refractory Iron-tin Ore in Yunnan Province

The grade of iron and tin in a low grade refractory iron-tin ore in Yunnan is 30.91% and 0.23%， respectively. The main recovered minerals are magnetite and cassiterite. In order to fully recover the valuable components in the ore， according to the properties of the raw ore， the process of iron selection with magnetic separation， sulfur selection with flotation， desliming， and cassiterite separation (gravity separation + flotation) was determined to carry out the beneficiation test research. A low intensity magnetic concentrate with iron grade of 60.69% and iron recovery rate of 78.63% could be obtained from the raw ore through a two-stage magnetic separation with one roughing and one cleaning. After one roughing， one cleaning and two scavenging， the sulfur grade of floating sulfur tailings is reduced to 0.46%， and the tin operation recovery rate of sulfur concentrate is only 6.88%. The floating sulfur tailings were screened into +0.043 mm and -0.043 mm samples. The shaker concentrate with tin grade of 6.48% and recovery rate of 52.54% was obtained by shaker using the +0.043 mm samples. After the sliming of -0.01 mm fine sludge by water purification， tin concentrate with tin grade of 5.69% and operation recovery rate of 70.23% could be obtained in closed-circuit flotation with salicylic hydroxamic acid and GZ as cassiterite collector and No.2 oil as frothing agent. The tin grade in the tailings is reduced to 0.12%. The magnetite concentrate with iron grade of 60.69% and iron recovery rate of 78.63% and tin concentrate with tin grade of 5.92% and tin recovery rate of 31.93% were obtained in the whole process. The tin grade in the tailings was reduced to 0.14%， which realized the comprehensive recovery of the iron and tin ore resources.